diff --git a/src/org/mozilla/javascript/InterfaceAdapter.java b/src/org/mozilla/javascript/InterfaceAdapter.java
index 513101920b..e850522a42 100644
--- a/src/org/mozilla/javascript/InterfaceAdapter.java
+++ b/src/org/mozilla/javascript/InterfaceAdapter.java
@@ -152,9 +152,8 @@ Object invokeImpl(
                 }
             }
         }
-        Scriptable thisObj = wf.wrapAsJavaObject(cx, topScope, thisObject, null);
 
-        Object result = function.call(cx, topScope, thisObj, args);
+        Object result = function.call(cx, topScope, (Scriptable) target, args);
         Class<?> javaResultType = method.getReturnType();
         if (javaResultType == Void.TYPE) {
             result = null;
diff --git a/testsrc/org/mozilla/javascript/tests/JavaAdapterInvokeTest.java b/testsrc/org/mozilla/javascript/tests/JavaAdapterInvokeTest.java
new file mode 100644
index 0000000000..6ef569f6ed
--- /dev/null
+++ b/testsrc/org/mozilla/javascript/tests/JavaAdapterInvokeTest.java
@@ -0,0 +1,111 @@
+package org.mozilla.javascript.tests;
+
+import org.junit.After;
+import org.junit.Assert;
+import org.junit.Before;
+import org.junit.Test;
+import org.mozilla.javascript.Context;
+import org.mozilla.javascript.Scriptable;
+
+public class JavaAdapterInvokeTest {
+    Context cx = null;
+    Scriptable topScope = null;
+
+    @Before
+    public void enterContext() {
+        cx = Context.enter();
+        cx.setOptimizationLevel(-1);
+        topScope = cx.initStandardObjects();
+    }
+
+    @After
+    public void exitContext() {
+        Context.exit();
+    }
+
+    public interface AdapterInterface {
+        int m1(int i);
+
+        int m2();
+    }
+
+    public static class AdapterClass {
+        private AdapterInterface adapter;
+
+        public AdapterClass(AdapterInterface adapter) {
+            this.adapter = adapter;
+        }
+
+        public int doIt(int i) {
+            return this.adapter.m1(i) + this.adapter.m2();
+        }
+    }
+
+    @Test
+    public void testInvoke() throws NoSuchMethodException {
+        String testCode =
+                "'use strict'\n"
+                        + "var impl = {"
+                        + "  m1: function(i) { return i + 1 },\n"
+                        + "  m2: function() { return 7 }\n"
+                        + "}\n"
+                        + "adapter = new Packages."
+                        + AdapterClass.class.getName()
+                        + "(impl)\n"
+                        + "adapter.doIt(42)";
+
+        Number result = (Number) cx.evaluateString(topScope, testCode, "", 1, null);
+        Assert.assertEquals(50, result.intValue());
+    }
+
+    @Test
+    public void testInvokeWithPrototype() throws NoSuchMethodException {
+        String testCode =
+                "'use strict'\n"
+                        + "function Obj() {}\n"
+                        + "Obj.prototype.m1 = function(i) { return i + 1 }\n"
+                        + "Obj.prototype.m2 = function() { return 7 }\n"
+                        + "var impl = new Obj()\n"
+                        + "adapter = new Packages."
+                        + AdapterClass.class.getName()
+                        + "(impl)\n"
+                        + "adapter.doIt(42)";
+
+        Number result = (Number) cx.evaluateString(topScope, testCode, "", 1, null);
+        Assert.assertEquals(50, result.intValue());
+    }
+
+    @Test
+    public void testInvokeWithPrototypeAndCtor() throws NoSuchMethodException {
+        String testCode =
+                "'use strict'\n"
+                        + "function Obj() { this.myObj = {one: 1} }\n"
+                        + "Obj.prototype.m1 = function(i) { return i + this.myObj.one }\n"
+                        + "Obj.prototype.m2 = function() { return 7 }\n"
+                        + "var impl = new Obj()\n"
+                        + "adapter = new Packages."
+                        + AdapterClass.class.getName()
+                        + "(impl)\n"
+                        + "adapter.doIt(42)";
+
+        Number result = (Number) cx.evaluateString(topScope, testCode, "", 1, null);
+        Assert.assertEquals(50, result.intValue());
+    }
+
+    @Test
+    public void testInvokeJsOnly() throws NoSuchMethodException {
+        String testCode =
+                "'use strict'\n"
+                        + "function Obj() { this.myObj = {one: 1} }\n"
+                        + "Obj.prototype.m1 = function(i) { return i + this.myObj.one }\n"
+                        + "Obj.prototype.m2 = function() { return 7 }\n"
+                        + "function Adapter(adapter) { this.adapter = adapter }\n"
+                        + "Adapter.prototype.doIt = function(i) { return this.adapter.m1(i) + this.adapter.m2() }\n"
+                        + "var impl = new Obj()\n"
+                        + "adapter = new Adapter(impl)\n"
+                        + "adapter.doIt(42)";
+
+        Number result = (Number) cx.evaluateString(topScope, testCode, "", 1, null);
+        Assert.assertEquals(50, result.intValue());
+    }
+}